"My housemate was assaulted on Friday night by her boyfriend resulting in a broken nose and chipped front teeth. Despite calling you the night of the attack, making statements and the medical reports on top of his messages admitting his guilt she has been told nothing can be done because nobody witnessed it," she wrote.

"Great job guys!! This is why women are failing to report and even dying due to domestic violence."

Several friends followed suit, posting similar message of disgust to the page. Fairfax Media columnist and outspoken feminist Clementine Ford posted details of the case to her 94,000 followers on Facebook, triggering a barrage of complaints of police inaction.

In a statement to Fairfax Media, a spokesperson for NSW Police said: "Police are investigating the full circumstances surrounding an alleged domestic assault that occurred about 12.45am on Saturday 12 December 2015 at an address in Oxley Park".

"Both parties have been formally interviewed and follow-up inquiries are continuing with the investigation."

Fairfax Media understands the investigation will include an inquiry into how police initially responded to the incident.

Mr Toro was served with an AVO on Monday night.

But Ms Savins and Ms Sutton said the police only acted after the onslaught of Facebook messages.

Ms Savins said when she was called in to St Marys LAC to give another statement, she was told that the renewed inquiries were due to the Facebook comments.

"I am still in shock and haven't gotten my head around it," Ms Savins said.

"I'm so disappointed in the police because they're only taking this seriously now that they are getting bad press.

"I'm very disappointed I can't rely on the people who are there to protect us. If you can't rely on the police, who else can you rely on?"

Ms Savins said she was driven to pursue her case, even though she loved Mr Toro, because she wanted to take a stand against domestic violence.

"I had to [do] this for myself and every other woman who goes through this or will potentially go through this," the 19-year-old said.

She said she was overwhelmed by the support she received on Facebook following her housemate's initial post.

"It's really nice to know I'm not alone," she said.

Fairfax Media attempted to contact Mr Toro for comment.

For help or information, can 1800 RESPECT (1800 737 732) or Men's Referral Service 1300 766 491